There seems to be an exercise now running to identify broken links and, if possible, substitute a replacement link from web.archive.org. I've received a few edit notifications regarding old posts which have been updated because of this. I guess this is done with script (or even AI) support. I'm curious to know how this works in practice. If the web site returns a 404 error then the case is clear. If, however, the domain still exists and there is a redirect to a more general search or profile page it must be quite difficult to identify that the link is no longer relevant. The edit notifications come in @pert 's name.
Of course I find this good because often, when I receive a notification that a link I have supplied has been accessed 50 (or even 300) times, I find the link is dead and have to attempt to find a substitute.